Water spray gun



FIG. 1 is a perspective view of a water spray gun showing my design.

FIG. 2 is a frontal view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a opposite side view thereof;

FIG. 6 is a plan view thereof; and,

FIG. 7 is a bottom view thereof. 

I claim the ornamental design for a water spray gun, as shown and described. 